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OCP Java 8 Study Guide - Requirements for reduce arguments, page 374  RSS feed

 
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Just a mention regarding a rule for reduce() function for a stream:

The identity must be defined such that for all elements in the stream u, combiner.apply(identity, u) is equal to u.


The elements u are not from the stream and have the type of the reduction result.
 
Alexandru Dragoi
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I think I forgot to close some tags. Sorry for this!
 
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Alexandru Dragoi wrote:I think I forgot to close some tags. Sorry for this!


No worries. I fixed it. (You had open tags instead of close tags for the tt's.)
 
It is sorta covered in the JavaRanch Style Guide.
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